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PM10 Air Trend Plots
For PM10, most high values tend to occur during wintertime inversions. In the summertime, high wind events can also lead to unusually high PM10 values. Trends are somewhat difficult to evaluate because weather plays such a large role in the data collected from year-to-year. This is why the standard is evaluated over a three-year period.
The fluctuations in this chart reflect the variability produced by meteorology and high-wind events.
Chart of the highest PM10 24-hr concentrations recorded from 2008-2015
This reflects control measures implemented through the PM10 SIP between 1992-1994. Controls were directed at reducing high concentrations typically recorded during wintertime inversions. Much of the PM10 that was controlled was secondary PM and would have been measured as PM2.5.